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Date: Tue, 24 Apr 2007 22:59:18 +0200 From: Ingo Molnar <mingo@...e.hu> To: Daniel Walker <dwalker@...sta.com> Cc: Jeremy Fitzhardinge <jeremy@...p.org>, Andrew Morton <akpm@...ux-foundation.org>, Prarit Bhargava <prarit@...hat.com>, Rick Lindsley <ricklind@...ibm.com>, john stultz <johnstul@...ibm.com>, Linux Kernel <linux-kernel@...r.kernel.org>, Eric Dumazet <dada1@...mosbay.com>, virtualization@...ts.osdl.org, Chris Lalancette <clalance@...hat.com>, Paul Mackerras <paulus@...ba.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [patch 1/4] Ignore stolen time in the softlockup watchdog * Daniel Walker <dwalker@...sta.com> wrote: > On Tue, 2007-04-24 at 13:24 -0700, Jeremy Fitzhardinge wrote: > > > And sched_clock's use of local_irq_save/restore appears to be absolutely > > correct, so I think it must be triggering a bug in either the self-tests > > or lockdep itself. > > Why does sched_clock need to disable interrupts? i concur. To me it appears not "absolutely correct" that someone apparently added local_irq_save/restore to sched_clock(), but "absolute madness". sched_clock() is _very_ performance-sensitive for the scheduler, do not mess with it. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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